How to backup/restore an ejabberd cluster

Hi everyone,
I have an ejabberd cluster with 6 nodes and mnesia data store. How can I backup and restore database considering that I have changed mnesia configuration(from remote copy to RAM/Disk copy) so that I slave can work on their own?

I know there are ejabberdctl and web interface. I just can't decide whether the backup/restore procedure needs to be done only on master or on all cluster nodes.

Thanks for your help.

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